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Related Concept Videos

Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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Transmission Electron Microscopy01:15

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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Atomic Emission Spectroscopy: Instrumentation01:22

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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Electrochemical Etching and Characterization of Sharp Field Emission Points for Electron Impact Ionization
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Cross-Process Interference in Single-Cycle Electron Emission from Metal Needle Tips.

Anne Herzig1, Peter Hommelhoff2, Eleftherios Goulielmakis1

  • 1University of Rostock, Institute of Physics, D-18059 Rostock, Germany.

Physical Review Letters
|March 1, 2026
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Summary
This summary is machine-generated.

Quantum interference reveals electron dynamics in solids, enabling new ultrafast metrology techniques for materials science. This study unlocks insights into electron birth times and acceleration using metal needle tips.

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Area of Science:

  • Solid-state physics
  • Quantum optics
  • Ultrafast science

Background:

  • Quantum interference is key to understanding photoemission in atoms and molecules.
  • Investigating strong-field photoemission in solids has been challenging.

Purpose of the Study:

  • To explore strong-field photoemission in solids using metal needle tips.
  • To understand electron dynamics and interference patterns in solid-state systems.

Main Methods:

  • Utilized classical trajectories combined with quantum interference.
  • Employed numerical solutions of the time-dependent Schrödinger equation.
  • Investigated metal needle tips subjected to single-cycle pulses.

Main Results:

  • Observed interference between direct and backscattered electrons.
  • Identified fringe patterns encoding subcycle information on electron birth times.
  • Revealed near-field driven acceleration dynamics.

Conclusions:

  • Interference patterns provide subcycle temporal resolution in solids.
  • Opens new pathways for ultrafast solid-state metrology.
  • Advances understanding of strong-field electron dynamics in condensed matter.